PreviewURL is nil on old macOS for some reason

Just need to append ?preview=1 to attachment fetch operation.

Dumped Classes/IMCore_ClassDump.h

@@ -3457,6 +3457,7 @@ __attribute__((visibility("default"))) @interface IMService : NSObject { }
 - (id)loadUnreadMessagesWithLimit:(unsigned long long)arg1 fallbackToMessagesUpToGUID:(id)arg2;
 - (id)loadFrequentRepliesLimit:(unsigned long long)arg1 loadImmediately:(BOOL)arg2;
 - (id)loadMessagesBeforeAndAfterGUID:(id)arg1 numberOfMessagesToLoadBeforeGUID:(unsigned long long)arg2 numberOfMessagesToLoadAfterGUID:(unsigned long long)arg3 loadImmediately:(BOOL)arg4;
+- (id)loadMessagesBeforeAndAfterGUID:(id)arg1 numberOfMessagesToLoadBeforeGUID:(unsigned long long)arg2 numberOfMessagesToLoadAfterGUID:(unsigned long long)arg3 loadImmediately:(BOOL)arg4 threadIdentifier:(id)tid;
 - (id)loadMessagesUpToGUID:(id)arg1 date:(id)arg2 limit:(unsigned long long)arg3 loadImmediately:(BOOL)arg4;
 - (id)loadMessagesBeforeDate:(id)arg1 limit:(unsigned long long)arg2 loadImmediately:(BOOL)arg3;
 - (id)loadMessagesBeforeDate:(id)arg1 limit:(unsigned long long)arg2;

Dumped Classes/IMSharedUtilities_ClassDump.h

@@ -18,12 +18,18 @@ struct IMFileLocation_t {
     int _field5;
 };
 
-struct IMPreviewConstraints {
-    double _field1;
-    struct CGSize _field2;
-    double _field3;
-    char _field4;
-};
+typedef struct IMPreviewConstraints {
+    CGFloat maxPxWidth;
+    CGSize minThumbnailPxSize;
+    CGFloat scale;
+    BOOL isSticker;
+    BOOL generateMetadata;
+} IMPreviewConstraints;
+
+extern IMPreviewConstraints IMPreviewConstraintsFromDictionary(NSDictionary *dictionary);
+extern NSDictionary *IMPreviewConstraintsDictionaryFromConstraint(IMPreviewConstraints constraint);
+extern BOOL IMPreviewConstraintsEqualToConstraints(IMPreviewConstraints constraints1, IMPreviewConstraints constraints2);
+extern IMPreviewConstraints IMPreviewConstraintsZero(void);
 
 struct _TidyDoc {
     int _field1;
@@ -155,6 +161,8 @@ struct __va_list_tag {
 - (void)setObject:(id)arg1 forKey:(id)arg2;
 @end
 
+extern NSURL* IMAttachmentPreviewFileURL(NSURL *attachmentURL, NSString *extension, BOOL generateIntermediaryDirectories);
+
 @protocol IMPreviewGeneratorProtocol
 + (BOOL)shouldShadePreview;
 + (BOOL)shouldScaleUpPreview;

MessagesBridge.xcodeproj/project.pbxproj

@@ -73,6 +73,10 @@
 		CD14F1A4219FF22700E7DD22 /* IMMessageItem+Encoded.m in Sources */ = {isa = PBXBuildFile; fileRef = CD14F1A3219FF22700E7DD22 /* IMMessageItem+Encoded.m */; };
 		CD14F1AA219FF3B800E7DD22 /* MBIMUpdateQueue.m in Sources */ = {isa = PBXBuildFile; fileRef = CD14F1A9219FF3B800E7DD22 /* MBIMUpdateQueue.m */; };
 		CD14F1AD219FFAE100E7DD22 /* MBIMConcurrentHTTPServer.m in Sources */ = {isa = PBXBuildFile; fileRef = CD14F1AC219FFAE100E7DD22 /* MBIMConcurrentHTTPServer.m */; };
+		CD2782BC29527FE500C0C030 /* IMSharedUtilities.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = CD2782BB29527FE500C0C030 /* IMSharedUtilities.framework */; };
+		CD2782BF2952832B00C0C030 /* MBIMImageUtils.m in Sources */ = {isa = PBXBuildFile; fileRef = CD2782BE2952832B00C0C030 /* MBIMImageUtils.m */; };
+		CD2782FE2952875F00C0C030 /* CoreGraphics.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = CD2782FD2952875F00C0C030 /* CoreGraphics.framework */; };
+		CD2783002952876700C0C030 /* ImageIO.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = CD2782FF2952876700C0C030 /* ImageIO.framework */; };
 		CD2ECEC2269539100055E302 /* MBIMAuthenticateOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CD2ECEC1269539100055E302 /* MBIMAuthenticateOperation.m */; };
 		CD2ECEC526953F2A0055E302 /* MBIMAuthToken.m in Sources */ = {isa = PBXBuildFile; fileRef = CD2ECEC426953F2A0055E302 /* MBIMAuthToken.m */; };
 		CD602056219B5DFD0024D9C5 /* MBIMBridgeOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CD602055219B5DFD0024D9C5 /* MBIMBridgeOperation.m */; };
@@ -81,6 +85,9 @@
 		CD602062219B68950024D9C5 /* MBIMSendMessageOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CD602061219B68950024D9C5 /* MBIMSendMessageOperation.m */; };
 		CD83E156219BE10A00F4CCEA /* hooking.m in Sources */ = {isa = PBXBuildFile; fileRef = CD83E155219BE10A00F4CCEA /* hooking.m */; };
 		CD83E166219BE91600F4CCEA /* agentHook.m in Sources */ = {isa = PBXBuildFile; fileRef = CD83E165219BE91600F4CCEA /* agentHook.m */; };
+		CD936A32289B353F0093A1AC /* MBIMErrorResponse.m in Sources */ = {isa = PBXBuildFile; fileRef = CD936A31289B353F0093A1AC /* MBIMErrorResponse.m */; };
+		CD936A35289B47D60093A1AC /* MBIMVersionOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CD936A34289B47D50093A1AC /* MBIMVersionOperation.m */; };
+		CD936A39289B49FC0093A1AC /* MBIMStatusOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CD936A38289B49FC0093A1AC /* MBIMStatusOperation.m */; };
 		CDDCF78D283F398C0087ABDF /* MBIMDeleteConversationOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CDDCF78C283F398C0087ABDF /* MBIMDeleteConversationOperation.m */; };
 		CDE4556421A3578A0041F5DD /* IMChat+Encoded.m in Sources */ = {isa = PBXBuildFile; fileRef = CDE4556321A3578A0041F5DD /* IMChat+Encoded.m */; };
 		CDE455A121A365AD0041F5DD /* MBIMMarkOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CDE455A021A365AD0041F5DD /* MBIMMarkOperation.m */; };
@@ -220,6 +227,11 @@
 		CD14F1A9219FF3B800E7DD22 /* MBIMUpdateQueue.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMUpdateQueue.m; sourceTree = "<group>"; };
 		CD14F1AB219FFAE100E7DD22 /* MBIMConcurrentHTTPServer.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMConcurrentHTTPServer.h; sourceTree = "<group>"; };
 		CD14F1AC219FFAE100E7DD22 /* MBIMConcurrentHTTPServer.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMConcurrentHTTPServer.m; sourceTree = "<group>"; };
+		CD2782BB29527FE500C0C030 /* IMSharedUtilities.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = IMSharedUtilities.framework; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.0.Internal.sdk/System/Library/PrivateFrameworks/IMSharedUtilities.framework; sourceTree = DEVELOPER_DIR; };
+		CD2782BD2952832B00C0C030 /* MBIMImageUtils.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMImageUtils.h; sourceTree = "<group>"; };
+		CD2782BE2952832B00C0C030 /* MBIMImageUtils.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMImageUtils.m; sourceTree = "<group>"; };
+		CD2782FD2952875F00C0C030 /* CoreGraphics.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreGraphics.framework; path = System/Library/Frameworks/CoreGraphics.framework; sourceTree = SDKROOT; };
+		CD2782FF2952876700C0C030 /* ImageIO.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = ImageIO.framework; path = System/Library/Frameworks/ImageIO.framework; sourceTree = SDKROOT; };
 		CD2ECEC0269539100055E302 /* MBIMAuthenticateOperation.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMAuthenticateOperation.h; sourceTree = "<group>"; };
 		CD2ECEC1269539100055E302 /* MBIMAuthenticateOperation.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMAuthenticateOperation.m; sourceTree = "<group>"; };
 		CD2ECEC326953F2A0055E302 /* MBIMAuthToken.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMAuthToken.h; sourceTree = "<group>"; };
@@ -237,6 +249,13 @@
 		CD83E161219BE91500F4CCEA /* libagentHook.dylib */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.dylib"; includeInIndex = 0; path = libagentHook.dylib; sourceTree = BUILT_PRODUCTS_DIR; };
 		CD83E165219BE91600F4CCEA /* agentHook.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = agentHook.m; sourceTree = "<group>"; };
 		CD83E1B5219BF78E00F4CCEA /* hookAgent.sh */ = {isa = PBXFileReference; lastKnownFileType = text.script.sh; path = hookAgent.sh; sourceTree = "<group>"; };
+		CD936A2F289B31740093A1AC /* kordophoned-RestrictedEntitlements.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = "kordophoned-RestrictedEntitlements.plist"; sourceTree = "<group>"; };
+		CD936A30289B353F0093A1AC /* MBIMErrorResponse.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMErrorResponse.h; sourceTree = "<group>"; };
+		CD936A31289B353F0093A1AC /* MBIMErrorResponse.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMErrorResponse.m; sourceTree = "<group>"; };
+		CD936A33289B47D50093A1AC /* MBIMVersionOperation.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMVersionOperation.h; sourceTree = "<group>"; };
+		CD936A34289B47D50093A1AC /* MBIMVersionOperation.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMVersionOperation.m; sourceTree = "<group>"; };
+		CD936A37289B49FC0093A1AC /* MBIMStatusOperation.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMStatusOperation.h; sourceTree = "<group>"; };
+		CD936A38289B49FC0093A1AC /* MBIMStatusOperation.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMStatusOperation.m; sourceTree = "<group>"; };
 		CDDCF78B283F398C0087ABDF /* MBIMDeleteConversationOperation.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMDeleteConversationOperation.h; sourceTree = "<group>"; };
 		CDDCF78C283F398C0087ABDF /* MBIMDeleteConversationOperation.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMDeleteConversationOperation.m; sourceTree = "<group>"; };
 		CDE4556221A3578A0041F5DD /* IMChat+Encoded.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "IMChat+Encoded.h"; sourceTree = "<group>"; };
@@ -277,8 +296,11 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				CD2782BC29527FE500C0C030 /* IMSharedUtilities.framework in Frameworks */,
 				1A257CCB23A8681200A4A2C8 /* Security.framework in Frameworks */,
+				CD2783002952876700C0C030 /* ImageIO.framework in Frameworks */,
 				1ACFCFDF219EB31400E2C237 /* CocoaHTTPServer.framework in Frameworks */,
+				CD2782FE2952875F00C0C030 /* CoreGraphics.framework in Frameworks */,
 				1A257CC923A867EF00A4A2C8 /* IMCore.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -324,6 +346,9 @@
 		1A0C445E219A45B400F2AC00 /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
+				CD2782FF2952876700C0C030 /* ImageIO.framework */,
+				CD2782FD2952875F00C0C030 /* CoreGraphics.framework */,
+				CD2782BB29527FE500C0C030 /* IMSharedUtilities.framework */,
 				1A257CCA23A8681200A4A2C8 /* Security.framework */,
 				1A257CC823A867EF00A4A2C8 /* IMCore.framework */,
 			);
@@ -356,8 +381,12 @@
 				1AA43E8E219EBB2D00EDF1A7 /* MBIMJSONDataResponse.m */,
 				CDE455A521A531ED0041F5DD /* MBIMDataResponse.h */,
 				CDE455A621A531ED0041F5DD /* MBIMDataResponse.m */,
+				CD936A30289B353F0093A1AC /* MBIMErrorResponse.h */,
+				CD936A31289B353F0093A1AC /* MBIMErrorResponse.m */,
 				1AA43E93219EC38E00EDF1A7 /* MBIMHTTPUtilities.h */,
 				1AA43E94219EC38E00EDF1A7 /* MBIMHTTPUtilities.m */,
+				CD2782BD2952832B00C0C030 /* MBIMImageUtils.h */,
+				CD2782BE2952832B00C0C030 /* MBIMImageUtils.m */,
 			);
 			path = Utilities;
 			sourceTree = "<group>";
@@ -523,10 +552,10 @@
 			isa = PBXGroup;
 			children = (
 				1AA43E90219EBB3400EDF1A7 /* Utilities */,
+				CD2ECEC0269539100055E302 /* MBIMAuthenticateOperation.h */,
+				CD2ECEC1269539100055E302 /* MBIMAuthenticateOperation.m */,
 				CD602054219B5DFD0024D9C5 /* MBIMBridgeOperation.h */,
 				CD602055219B5DFD0024D9C5 /* MBIMBridgeOperation.m */,
-				CD60205A219B623F0024D9C5 /* MBIMMessagesListOperation.h */,
-				CD60205B219B623F0024D9C5 /* MBIMMessagesListOperation.m */,
 				CD60205D219B674B0024D9C5 /* MBIMConversationListOperation.h */,
 				CD60205E219B674B0024D9C5 /* MBIMConversationListOperation.m */,
 				CDDCF78B283F398C0087ABDF /* MBIMDeleteConversationOperation.h */,
@@ -535,14 +564,18 @@
 				CDE455A321A5308D0041F5DD /* MBIMFetchAttachmentOperation.m */,
 				CDE4559F21A365AD0041F5DD /* MBIMMarkOperation.h */,
 				CDE455A021A365AD0041F5DD /* MBIMMarkOperation.m */,
+				CD60205A219B623F0024D9C5 /* MBIMMessagesListOperation.h */,
+				CD60205B219B623F0024D9C5 /* MBIMMessagesListOperation.m */,
 				CD602060219B68950024D9C5 /* MBIMSendMessageOperation.h */,
 				CD602061219B68950024D9C5 /* MBIMSendMessageOperation.m */,
+				CD936A37289B49FC0093A1AC /* MBIMStatusOperation.h */,
+				CD936A38289B49FC0093A1AC /* MBIMStatusOperation.m */,
 				CD14F19F219FE7D600E7DD22 /* MBIMUpdatePollOperation.h */,
 				CD14F1A0219FE7D600E7DD22 /* MBIMUpdatePollOperation.m */,
 				1AD8936C21EFD986009B599A /* MBIMUploadAttachmentOperation.h */,
 				1AD8936D21EFD986009B599A /* MBIMUploadAttachmentOperation.m */,
-				CD2ECEC0269539100055E302 /* MBIMAuthenticateOperation.h */,
-				CD2ECEC1269539100055E302 /* MBIMAuthenticateOperation.m */,
+				CD936A33289B47D50093A1AC /* MBIMVersionOperation.h */,
+				CD936A34289B47D50093A1AC /* MBIMVersionOperation.m */,
 			);
 			path = Operations;
 			sourceTree = "<group>";
@@ -574,6 +607,7 @@
 				1A0C446D219A4BCD00F2AC00 /* Bridge */,
 				CDF62334219A895D00690038 /* main.m */,
 				1AAB32B221F835BD004A2A72 /* KPServer.pch */,
+				CD936A2F289B31740093A1AC /* kordophoned-RestrictedEntitlements.plist */,
 			);
 			path = kordophone;
 			sourceTree = "<group>";
@@ -682,6 +716,7 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = CDF62336219A895D00690038 /* Build configuration list for PBXNativeTarget "kordophoned" */;
 			buildPhases = (
+				CD936A36289B48930093A1AC /* Compile Version String */,
 				CDF6232E219A895D00690038 /* Sources */,
 				CDF6232F219A895D00690038 /* Frameworks */,
 				CDF62330219A895D00690038 /* CopyFiles */,
@@ -778,6 +813,24 @@
 			shellPath = /bin/sh;
 			shellScript = "# Type a script or drag a script file from your workspace to insert its path.\n\nRESULT=$(install_name_tool -delete_rpath $BUILT_PRODUCTS_DIR $BUILT_PRODUCTS_DIR/$EXECUTABLE_NAME 2> /dev/null)\n\ninstall_name_tool -add_rpath $BUILT_PRODUCTS_DIR $BUILT_PRODUCTS_DIR/$EXECUTABLE_NAME\n";
 		};
+		CD936A36289B48930093A1AC /* Compile Version String */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+			);
+			name = "Compile Version String";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "# Type a script or drag a script file from your workspace to insert its path.\nOUTPUT_FILE=\"$DERIVED_FILE_DIR/MBIMVersion.c\"\nVERSION_STR=`git describe`\n\necho \"const char* MBIMVersion() { return \\\"$VERSION_STR\\\"; }\" > $OUTPUT_FILE\n";
+		};
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
@@ -850,12 +903,16 @@
 				CD14F1A4219FF22700E7DD22 /* IMMessageItem+Encoded.m in Sources */,
 				CD602062219B68950024D9C5 /* MBIMSendMessageOperation.m in Sources */,
 				CD14F1A1219FE7D600E7DD22 /* MBIMUpdatePollOperation.m in Sources */,
+				CD936A39289B49FC0093A1AC /* MBIMStatusOperation.m in Sources */,
 				CDE455A121A365AD0041F5DD /* MBIMMarkOperation.m in Sources */,
 				CDE455A721A531ED0041F5DD /* MBIMDataResponse.m in Sources */,
+				CD936A35289B47D60093A1AC /* MBIMVersionOperation.m in Sources */,
 				CD602056219B5DFD0024D9C5 /* MBIMBridgeOperation.m in Sources */,
 				CD60205F219B674B0024D9C5 /* MBIMConversationListOperation.m in Sources */,
 				CDE4556421A3578A0041F5DD /* IMChat+Encoded.m in Sources */,
+				CD2782BF2952832B00C0C030 /* MBIMImageUtils.m in Sources */,
 				1AA43E8F219EBB2D00EDF1A7 /* MBIMJSONDataResponse.m in Sources */,
+				CD936A32289B353F0093A1AC /* MBIMErrorResponse.m in Sources */,
 				CD2ECEC2269539100055E302 /* MBIMAuthenticateOperation.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -1124,6 +1181,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = NO;
+				CODE_SIGN_ENTITLEMENTS = "kordophone/kordophoned-RestrictedEntitlements.plist";
 				CODE_SIGN_IDENTITY = "-";
 				CODE_SIGN_STYLE = Automatic;
 				GCC_PREFIX_HEADER = kordophone/KPServer.pch;

README.md

@@ -7,6 +7,9 @@ sudo defaults write /Library/Preferences/com.apple.security.coderequirements Ent
 
 Maybe a better thing to do is to DYLD_PRELOAD `imagent` and swizzle `IMDAuditTokenTaskHasEntitlement` to always return YES. 
 
+Included in the project is "kordophoned-RestrictedEntitlements.plist", which contains all necessary restricted entitlements. 
+On production macOS builds, the kernel will kill kordophoned immediately if it's signed using restricted entitlements, so agent hook is a
+better option when running on prod machines. By default, the project is configured to ignore kordophoned-RestrictedEntitlements.plist when building. 
 
 ## Building/linking 
 If you get dyld errors running from the command line, use `install_name_tool` to update the @rpath (where @rpath points to where linked Frameworks like GCDWebServer is).

kordophone/Bridge/Operations/MBIMFetchAttachmentOperation.m

@@ -8,8 +8,11 @@
 
 #import "MBIMFetchAttachmentOperation.h"
 #import "MBIMDataResponse.h"
+#import "MBIMImageUtils.h"
 
 #import "IMCore_ClassDump.h"
+#import "IMSharedUtilities_ClassDump.h"
+#import <CoreGraphics/CoreGraphics.h>
 
 @implementation MBIMFetchAttachmentOperation
 
@@ -24,8 +27,8 @@
 {
     NSObject<HTTPResponse> *response = nil;
     do {
+        BOOL preview = [[self valueForQueryItemWithName:@"preview"] boolValue];
         NSString *guid = [self valueForQueryItemWithName:@"guid"];
-        
         if (!guid) {
             MBIMLogInfo(@"No query item provided");
             response = [[HTTPErrorResponse alloc] initWithErrorCode:500];
@@ -45,22 +48,68 @@
             break;
         }
         
-        NSString *localPath = [transfer localPath];
-        NSData *responseData = [NSData dataWithContentsOfFile:localPath];
+        NSData *responseData = nil;
+        NSURL *localURL = [transfer localURL];
+        NSString *extension = [[localURL pathExtension] lowercaseString];
+        if (preview) {
+            NSURL *previewURL = IMAttachmentPreviewFileURL(localURL, extension, YES);
+            if (![[NSFileManager defaultManager] fileExistsAtPath:[previewURL path]]) {
+                MBIMLogInfo(@"Generating preview image for guid: %@ at %@", guid, [previewURL path]);
+                
+                // Fetch preview constraints from transfer
+                NSDictionary *previewConstraintsDict = [[transfer attributionInfo] objectForKey:@"pgenszc"];
+                if (!previewConstraintsDict) {
+                    MBIMLogInfo(@"No preview constraints for attachment guid: %@", guid);
+                    response = [[HTTPErrorResponse alloc] initWithErrorCode:500];
+                    break;
+                }
+                
+                IMPreviewConstraints constraints = IMPreviewConstraintsFromDictionary(previewConstraintsDict);
+                
+                // Generate preview using preview generator manager
+                NSError *error = nil;
+                IMPreviewGeneratorManager *generator = [IMPreviewGeneratorManager sharedInstance];
+                CGImageRef previewImage = [generator newPreviewFromSourceURL:localURL withPreviewConstraints:constraints error:&error];
+                if (error) {
+                    MBIMLogInfo(@"Unable to generate preview for attachment guid: %@", guid);
+                    response = [[HTTPErrorResponse alloc] initWithErrorCode:500];
+                    break;
+                }
+                
+                // Convert to JPEG.
+                responseData = MBIMCGImageJPEGRepresentation(previewImage);
+                
+                // Persist JPEG preview to disk
+                if (previewURL) {
+                    [responseData writeToURL:previewURL atomically:YES];
+                }
+            } else {
+                // File exists
+                MBIMLogInfo(@"Using cached preview image for guid: %@ at %@", guid, [previewURL path]);
+                responseData = [NSData dataWithContentsOfURL:previewURL];
+            }
+        } else {
+            responseData = [NSData dataWithContentsOfURL:localURL];
+        }
+         
         if (!responseData) {
-            MBIMLogInfo(@"Wasn't able to load data from local path: %@", localPath);
+            MBIMLogInfo(@"Wasn't able to load data for guid: %@", guid);
             response = [[HTTPErrorResponse alloc] initWithErrorCode:404];
             break;
         }
         
         NSString *mimeType = [transfer mimeType];
+        if ([mimeType isEqualToString:@"image/heic"]) {
+            // TODO: We should convert this to JPEG here. I don't want clients to have to deal with HEIC.
+            MBIMLogInfo(@"WARNING: Returning HEIC data for attachment %@", guid);
+        }
+        
         // It's unusual, but if this is nil, try to guess the MIME type based on the filename
         if (!mimeType) {
-            NSString *extension = [[localPath pathExtension] lowercaseString];
-
             // XXX: REALLY hacky
             mimeType = [NSString stringWithFormat:@"image/%@", extension];
         }
+        
         response = [[MBIMDataResponse alloc] initWithData:responseData contentType:mimeType];
     } while (0);
     

kordophone/Bridge/Operations/MBIMMessagesListOperation.m

@@ -9,9 +9,17 @@
 #import "MBIMMessagesListOperation.h"
 #import "MBIMHTTPUtilities.h"
 #import "IMMessageItem+Encoded.h"
+#import "MBIMErrorResponse.h"
 
 #import "IMCore_ClassDump.h"
 
+#define kDefaultMessagesLimit 75
+
+@interface IMChat (MBIMSafeMessagesLoading)
+- (void)load:(NSUInteger)number messagesBeforeGUID:(NSString *)beforeMessageGUID;
+- (void)load:(NSUInteger)number messagesAfterGUID:(NSString *)afterMessageGUID;
+@end
+
 @implementation MBIMMessagesListOperation
 
 + (void)load { [super load]; }
@@ -25,11 +33,32 @@
 {
     __block NSObject<HTTPResponse> *response = nil;
     do {
+        // Required parameters
         NSString *guid = [self valueForQueryItemWithName:@"guid"];
         
+        // Optional
+        NSString *limitValue = [self valueForQueryItemWithName:@"limit"];
+        
+        NSDate *beforeDate = nil;
+        NSString *beforeDateValue = [self valueForQueryItemWithName:@"beforeDate"];
+        if (beforeDateValue) {
+            beforeDate = [beforeDateValue ISO8601Date];
+            if (!beforeDate) {
+                response = [[MBIMErrorResponse alloc] initWithErrorCode:500 message:@"Unable to decode ISO8601 beforeDate value"];
+                break;
+            }
+        }
+        
+        NSString *beforeMessageGUID = [self valueForQueryItemWithName:@"beforeMessageGUID"];
+        NSString *afterMessageGUID = [self valueForQueryItemWithName:@"afterMessageGUID"];
+        
+        if (beforeMessageGUID && afterMessageGUID) {
+            response = [[MBIMErrorResponse alloc] initWithErrorCode:500 message:@"Cannot provide both beforeMessageGUID and afterMessageGUID params."];
+            break;
+        }
+        
         if (!guid) {
-            MBIMLogInfo(@"No query item provided");
-            response = [[HTTPErrorResponse alloc] initWithErrorCode:500];
+            response = [[MBIMErrorResponse alloc] initWithErrorCode:500 message:@"No GUID provided."];
             break;
         }
         
@@ -41,12 +70,35 @@
                 response = [[HTTPErrorResponse alloc] initWithErrorCode:500];
             } else {
                 // Load messages
-                [chat loadMessagesBeforeDate:[NSDate date] limit:50 loadImmediately:YES];
+                // (Must be done on main queue for some reason)
+                dispatch_sync(dispatch_get_main_queue(), ^{
+                    NSUInteger limit = kDefaultMessagesLimit;
+                    if (limitValue) {
+                        limit = [limitValue integerValue];
+                    }
                     
-                [[chat chatItems] enumerateMessagesWithOptions:0 usingBlock:^(IMMessage *message, BOOL *stop) {
-                    NSDictionary *messageDict = [message mbim_dictionaryRepresentation];
-                    [messages addObject:messageDict];
-                }];
+                    if (beforeMessageGUID) {
+                        [chat load:limit messagesBeforeGUID:beforeMessageGUID];
+                    } else if (afterMessageGUID) {
+                        [chat load:limit messagesAfterGUID:afterMessageGUID];
+                    } else {
+                        [chat loadMessagesBeforeDate:beforeDate limit:limit loadImmediately:YES];
+                    }
+                    
+                    [[chat chatItems] enumerateMessagesWithOptions:0 usingBlock:^(IMMessage *message, BOOL *stop) {
+                        // Assume "beforeMessageGUID" is exclusive
+                        if ([[message guid] isEqual:beforeMessageGUID]) {
+                            *stop = YES;
+                            return;
+                        }
+                        
+                        // Assume "afterMessageGUID" is exclusive.
+                        if (![[message guid] isEqual:afterMessageGUID]) {
+                            NSDictionary *messageDict = [message mbim_dictionaryRepresentation];
+                            [messages addObject:messageDict];
+                        }
+                    }];
+                });
             }
         });
         
@@ -57,3 +109,35 @@
 }
 
 @end
+
+@implementation IMChat (MBIMSafeMessagesLoading)
+
+- (id)_safe_loadMessagesBeforeAndAfterGUID:(NSString *)messagesGUID numberOfMessagesToLoadBeforeGUID:(NSUInteger)limitBefore numberOfMessagesToLoadAfterGUID:(NSUInteger)limitAfter loadImmediately:(BOOL)loadImmediately
+{
+    if ([self respondsToSelector:@selector(loadMessagesBeforeAndAfterGUID:
+                                           numberOfMessagesToLoadBeforeGUID:
+                                           numberOfMessagesToLoadAfterGUID:
+                                           loadImmediately:threadIdentifier:)]) {
+        return [self loadMessagesBeforeAndAfterGUID:messagesGUID
+                   numberOfMessagesToLoadBeforeGUID:limitBefore
+                    numberOfMessagesToLoadAfterGUID:limitAfter
+                                    loadImmediately:YES threadIdentifier:nil];
+    } else {
+        return [self loadMessagesBeforeAndAfterGUID:messagesGUID
+                   numberOfMessagesToLoadBeforeGUID:limitBefore
+                    numberOfMessagesToLoadAfterGUID:limitAfter
+                                    loadImmediately:YES];
+    }
+}
+
+- (void)load:(NSUInteger)number messagesBeforeGUID:(NSString *)beforeMessageGUID
+{
+    [self _safe_loadMessagesBeforeAndAfterGUID:beforeMessageGUID numberOfMessagesToLoadBeforeGUID:number numberOfMessagesToLoadAfterGUID:0 loadImmediately:YES];
+}
+
+- (void)load:(NSUInteger)number messagesAfterGUID:(NSString *)afterMessageGUID
+{
+    [self _safe_loadMessagesBeforeAndAfterGUID:afterMessageGUID numberOfMessagesToLoadBeforeGUID:0 numberOfMessagesToLoadAfterGUID:number loadImmediately:YES];
+}
+
+@end

kordophone/Bridge/Operations/MBIMStatusOperation.h

@@ -0,0 +1,17 @@
+//
+//  MBIMStatusOperation.h
+//  kordophoned
+//
+//  Created by James Magahern on 8/3/22.
+//  Copyright © 2022 James Magahern. All rights reserved.
+//
+
+#import "MBIMBridgeOperation.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MBIMStatusOperation : MBIMBridgeOperation
+
+@end
+
+NS_ASSUME_NONNULL_END

kordophone/Bridge/Operations/MBIMStatusOperation.m

@@ -0,0 +1,25 @@
+//
+//  MBIMStatusOperation.m
+//  kordophoned
+//
+//  Created by James Magahern on 8/3/22.
+//  Copyright © 2022 James Magahern. All rights reserved.
+//
+
+#import "MBIMStatusOperation.h"
+
+@implementation MBIMStatusOperation
+
++ (void)load { [super load]; }
+
++ (NSString *)endpointName
+{
+    return @"status";
+}
+
+- (void)main
+{
+    self.serverCompletionBlock([[MBIMDataResponse alloc] initWithData:[@"OK" dataUsingEncoding:NSUTF8StringEncoding]]);
+}
+
+@end

kordophone/Bridge/Operations/MBIMVersionOperation.h

@@ -0,0 +1,17 @@
+//
+//  MBIMVersionOperation.h
+//  kordophoned
+//
+//  Created by James Magahern on 8/3/22.
+//  Copyright © 2022 James Magahern. All rights reserved.
+//
+
+#import "MBIMBridgeOperation.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MBIMVersionOperation : MBIMBridgeOperation
+
+@end
+
+NS_ASSUME_NONNULL_END

kordophone/Bridge/Operations/MBIMVersionOperation.m

@@ -0,0 +1,40 @@
+//
+//  MBIMVersionOperation.m
+//  kordophoned
+//
+//  Created by James Magahern on 8/3/22.
+//  Copyright © 2022 James Magahern. All rights reserved.
+//
+
+#import "MBIMVersionOperation.h"
+#import "MBIMErrorResponse.h"
+
+#ifdef __clang_analyzer__
+const char* MBIMVersion() {
+    return "UNKNOWN";
+}
+#else
+#import "MBIMVersion.c"
+#endif
+
+@implementation MBIMVersionOperation
+
++ (void)load { [super load]; }
+
++ (BOOL)requiresAuthentication
+{
+    return NO;
+}
+
++ (NSString *)endpointName
+{
+    return @"version";
+}
+
+- (void)main
+{
+    NSString *versionString = [NSString stringWithUTF8String:MBIMVersion()];
+    self.serverCompletionBlock([[MBIMDataResponse alloc] initWithData:[versionString dataUsingEncoding:NSUTF8StringEncoding]]);
+}
+
+@end

kordophone/Bridge/Operations/Utilities/MBIMErrorResponse.h

@@ -0,0 +1,18 @@
+//
+//  MBIMErrorResponse.h
+//  kordophoned
+//
+//  Created by James Magahern on 8/3/22.
+//  Copyright © 2022 James Magahern. All rights reserved.
+//
+
+#import "HTTPDataResponse.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MBIMErrorResponse : HTTPDataResponse
+- (instancetype)initWithErrorCode:(int)httpErrorCode;
+- (instancetype)initWithErrorCode:(int)httpErrorCode message:(NSString *)message;
+@end
+
+NS_ASSUME_NONNULL_END

kordophone/Bridge/Operations/Utilities/MBIMErrorResponse.m

@@ -0,0 +1,38 @@
+//
+//  MBIMErrorResponse.m
+//  kordophoned
+//
+//  Created by James Magahern on 8/3/22.
+//  Copyright © 2022 James Magahern. All rights reserved.
+//
+
+#import "MBIMErrorResponse.h"
+
+@implementation MBIMErrorResponse {
+    int _status;
+}
+
+- (instancetype)initWithErrorCode:(int)httpErrorCode
+{
+    if (self = [super initWithData:nil]) {
+        _status = httpErrorCode;
+    }
+    
+    return self;
+}
+
+- (instancetype)initWithErrorCode:(int)httpErrorCode message:(NSString *)message
+{
+    if (self = [super initWithData:[message dataUsingEncoding:NSUTF8StringEncoding]]) {
+        _status = httpErrorCode;
+    }
+    
+    return self;
+}
+
+- (NSInteger)status
+{
+    return _status;
+}
+
+@end

kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.h

@@ -10,3 +10,13 @@
 
 NSString* MBIMWebServerFormatRFC822(NSDate *date);
 NSString* MBIMWebServerFormatISO8601(NSDate *date);
+
+@interface NSDate (MBIMWebServerFormat)
+- (NSString *)RFC822StringValue;
+- (NSString *)ISO8601StringValue;
+@end
+
+@interface NSString (MBIMWebServerFormat)
+- (NSDate *)RFC822Date;
+- (NSDate *)ISO8601Date;
+@end

kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.m

@@ -47,3 +47,31 @@ NSString* MBIMWebServerFormatISO8601(NSDate *date)
     
     return string;
 }
+
+@implementation NSDate (MBIMWebServerFormat)
+
+- (NSString *)RFC822StringValue
+{
+    return MBIMWebServerFormatRFC822(self);
+}
+
+- (NSString *)ISO8601StringValue
+{
+    return MBIMWebServerFormatISO8601(self);
+}
+
+@end
+
+@implementation NSString (MBIMWebServerFormat)
+
+- (NSDate *)RFC822Date
+{
+    return [_dateFormatterRFC822 dateFromString:self];
+}
+
+- (NSDate *)ISO8601Date
+{
+    return [_dateFormatterISO8601 dateFromString:self];
+}
+
+@end

kordophone/Bridge/Operations/Utilities/MBIMImageUtils.h

@@ -0,0 +1,12 @@
+//
+//  MBIMImageUtils.h
+//  kordophoned
+//
+//  Created by James Magahern on 12/20/22.
+//  Copyright © 2022 James Magahern. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <CoreGraphics/CoreGraphics.h>
+
+extern NSData* MBIMCGImageJPEGRepresentation(CGImageRef imageRef);

kordophone/Bridge/Operations/Utilities/MBIMImageUtils.m

@@ -0,0 +1,37 @@
+//
+//  MBIMImageUtils.m
+//  kordophoned
+//
+//  Created by James Magahern on 12/20/22.
+//  Copyright © 2022 James Magahern. All rights reserved.
+//
+
+#import "MBIMImageUtils.h"
+#import <ImageIO/ImageIO.h>
+
+NSData* MBIMCGImageJPEGRepresentation(CGImageRef imageRef)
+{
+    if (imageRef == NULL) return nil;
+    
+    NSNumber *const DPI = @72.0;
+    NSNumber *const compressionQuality = @0.9;
+    NSDictionary *properties = @{
+        (__bridge NSString *)kCGImagePropertyDPIWidth : DPI,
+        (__bridge NSString *)kCGImagePropertyDPIHeight : DPI,
+        (__bridge NSString *)kCGImageDestinationLossyCompressionQuality : compressionQuality,
+    };
+    
+    bool success = false;
+    NSMutableData *data = [NSMutableData data];
+    if (data) {
+        CGImageDestinationRef imageDestination = CGImageDestinationCreateWithData((CFMutableDataRef)data, CFSTR("public.jpeg"), 1/*count*/, NULL/*options*/);
+        if (imageDestination != NULL) {
+            CGImageDestinationAddImage(imageDestination, imageRef, (__bridge CFDictionaryRef)properties);
+            success = CGImageDestinationFinalize(imageDestination);
+            CFRelease(imageDestination);
+        }
+    }
+
+    return success ? data : nil;
+}
+

kordophone/Categories/IMMessageItem+Encoded.m

@@ -21,16 +21,27 @@
     
     if ([self fileTransferGUIDs]) {
         // Support only images right now
+        NSMutableDictionary *attachmentMetadatas = [NSMutableDictionary dictionary];
         NSMutableArray *filteredFileTransferGUIDs = [NSMutableArray array];
         for (NSString *guid in self.fileTransferGUIDs) {
+            NSMutableDictionary *metadata = [NSMutableDictionary dictionary];
             IMFileTransfer *transfer = [[IMFileTransferCenter sharedInstance] transferForGUID:guid];
             if ([[transfer mimeType] containsString:@"image"]) {
                 [filteredFileTransferGUIDs addObject:guid];
+                
+                if ([transfer attributionInfo] != nil) {
+                    metadata[@"attributionInfo"] = [transfer attributionInfo];
+                }
+            }
+            
+            if (metadata.count) {
+                attachmentMetadatas[guid] = metadata;
             }
         }
         
         if ([filteredFileTransferGUIDs count]) {
             messageDict[@"fileTransferGUIDs"] = filteredFileTransferGUIDs;
+            messageDict[@"attachmentMetadata"] = attachmentMetadatas;
         }
     }
     

kordophone/kordophoned-RestrictedEntitlements.plist

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.imagent</key>
+	<true/>
+	<key>com.apple.private.imagent</key>
+	<true/>
+	<key>com.apple.private.imcore.imagent</key>
+	<true/>
+	<key>com.apple.imagent.av</key>
+	<true/>
+	<key>com.apple.imagent.chat</key>
+	<true/>
+</dict>
+</plist>